/*
 *  linux/fs/stat.c
 *
 *  (C) 1991  Linus Torvalds
 */

#include "../include/errno.h"
#include "../include/sys/stat.h"

#include "../include/linux/fs.h"
#include "../include/linux/sched.h"
#include "../include/linux/kernel.h"
#include "../include/asm/segment.h"


static void cp_stat(struct m_inode * inode, struct stat * statbuf)
{
    struct stat tmp;
    int i;

    verify_area(statbuf,sizeof (struct stat));
    tmp.st_dev = inode->i_dev;
    tmp.st_ino = inode->i_num;
    tmp.st_mode = inode->i_mode;
    tmp.st_nlink = inode->i_nlinks;
    tmp.st_uid = inode->i_uid;
    tmp.st_gid = inode->i_gid;
    tmp.st_rdev = inode->i_zone[0];
    tmp.st_size = inode->i_size;
    tmp.st_atime = inode->i_atime;
    tmp.st_mtime = inode->i_mtime;
    tmp.st_ctime = inode->i_ctime;
    for (i=0 ; i<sizeof (tmp) ; i++)
        put_fs_byte(((char *) &tmp)[i],i + (char *) statbuf);
}

int sys_stat(char * filename, struct stat * statbuf)
{
    struct m_inode * inode;

    if (!(inode=namei(filename)))
        return -ENOENT;
    cp_stat(inode,statbuf);
    iput(inode);
    return 0;
}

int sys_lstat(char * filename, struct stat * statbuf)
{
    struct m_inode * inode;

    if (!(inode = lnamei(filename)))
        return -ENOENT;
    cp_stat(inode,statbuf);
    iput(inode);
    return 0;
}

int sys_fstat(unsigned int fd, struct stat * statbuf)
{
    struct file * f;
    struct m_inode * inode;

    if (fd >= NR_OPEN || !(f=current->filp[fd]) || !(inode=f->f_inode))
        return -EBADF;
    cp_stat(inode,statbuf);
    return 0;
}

int sys_readlink(const char * path, char * buf, int bufsiz)
{
    struct m_inode * inode;
    struct buffer_head * bh;
    int i;
    char c;

    if (bufsiz <= 0)
        return -EBADF;
    if (bufsiz > 1023)
        bufsiz = 1023;
    verify_area(buf,bufsiz);
    if (!(inode = lnamei(path)))
        return -ENOENT;
    if (inode->i_zone[0])
        bh = bread(inode->i_dev, inode->i_zone[0]);
    else
        bh = NULL;
    iput(inode);
    if (!bh)
        return 0;
    i = 0;
    while (i<bufsiz && (c = bh->b_data[i])) {
        i++;
        put_fs_byte(c,buf++);
    }
    brelse(bh);
    return i;
}